Promoting Charge Separation in g -C 3 N 4 /Graphene/MoS 2 Photocatalysts by Two-Dimensional Nanojunction for Enhanced Photocatalytic H 2 Production

Graphitic carbon nitride ( g -C 3 N 4 ) is a promising photocatalyst for solar H 2 generation, but the practical application of g -C 3 N 4 is still limited by the low separation efficiency of photogenerated charge carriers. Herein, we report the construction of ternary g -C 3 N 4 /graphene/MoS 2 two-dimensional nanojunction photocatalysts for enhanced visible light photocatalytic H 2 production from water. As demonstrated by photoluminescence and transient photocurrent studies, the intimate two-dimensional nanojuction can efficiently accelerate the charge transfer, resulting in the high photocatalytic activity. The g -C 3 N 4 /graphene/MoS 2 composite with 0.5% graphene and 1.2% MoS 2 achieves a high H 2 evolution rate of 317 μmol h –1 g –1, and the apparent quantum yield reaches 3.4% at 420 nm. More importantly, the ternary g -C 3 N 4 /graphene/MoS 2 two-dimensional nanojunction photocatalyst exhibits much higher photocatalytic activity than the optimized Pt-loaded g -C 3 N 4 photocatalyst.